Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uunet!wuarchive!decwrl!shelby!csli!poser
From: poser@csli.Stanford.EDU (Bill Poser)
Newsgroups: comp.unix.wizards
Subject: Re: FCC doing it again...
Message-ID: <11198@csli.Stanford.EDU>
Date: 30 Nov 89 08:04:23 GMT
References: <1989Nov28.011514.4193@virtech.uucp> <246@cfa.HARVARD.EDU> <23679@datapg.MN.ORG>
Sender: poser@csli.Stanford.EDU (Bill Poser)
Reply-To: poser@csli.stanford.edu (Bill Poser)
Distribution: usa
Organization: Center for the Study of Language and Information, Stanford U.
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In article <23679@datapg.MN.ORG> sewilco@datapg.MN.ORG (Scot E Wilcoxon) writes:
>A 3KHz voice transmission requires about 6000 bits per
>second (OK, maybe 4800bps?)

6000 bps for a 3Khz bandwidth means only 1 bit resolution. 1 bit speech
is surprisingly intelligible, but the quality is very poor. The telephone
system uses 8 bits per sample, as do the cheapo ADDACS you can buy
for personal computers. This gives a theoretical dynamic range of 48 dB.
(For speech research we try to get at least 12 bits resolution - good
research quality ADDACs give a theoretical 16 bits.) So the data rate
for telephone speech is 48K bits per second.